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Q9. A 1.6 m diameter cast iron cylinder cover is secured by 16 steel bolts which are each under a tensile stress of 18 MN/m². Each bolt is 25 mm in diameter and the stress in the cylinder cover is evenly distributed due to bolt tension.

Calculate EACH of the following:

(a) The stress in the cylinder cover; (8)

(b) The temperature rise which will reduce the stress in the cylinder cover and bolts to zero. (8)

Note:

Modulus of Elasticity for steel = 200 GN/m²

Modulus of Elasticity for cast iron = 100 GN/m²

Coefficient of linear expansion for steel = 12×10^-6/℃

Coefficient of linear expansion for cast iron = 11×10^-6